Now People has an exclusive source so close to the baby bump they can hear the heartbeat! The source confirms Khloé and BF future baby daddy Tristan Thompson are going to be mommy and daddy:

"Yes, Khloe and Tristan are expecting and they are absolutely thrilled. This isn't something they were in a rush to announce to the whole world, and it's only been in just the past week or so that they've felt comfortable telling most of their inner circle."

According to this friend, the happy couple were just about ready to make the big announcement — and then the Kylie Jenner news dropped, which kinda threw a wrench into their plans: